What is the partial pressure of oxygen in venous blood returning to the lungs? What is...

What is the partial pressure of oxygen in venous blood returning to the lungs?

What is the partial pressure of oxygen in arterial blood leaving the lungs?

What is the partial pressure of carbon dioxide in the lungs

Expert Solution

The partial pressure of oxygen in venous blood returning to the lungs is about 40 mm Hg.

Blood returning to the lungs is deoxygenated (venous) and it is returned through pulmonary arteries. The concentration of oxygen in this blood is very less, Hence the partial pressure is also less than the partial pressure of CO2 in this deoxygenated blood.

The partial pressure of oxygen in arterial blood leaving the lungs is about 100 mm Hg.

Blood leaving from the lungs is oxygenated (arterial) and flows through pulmonary veins. As the blood is oxygenated, the partial pressure of oxygen is higher in the blood leaving the lungs. In this oxygenated blood partial pressure of CO2 is less.

The partial pressure of carbon dioxide in the lungs is about 40 mm Hg.

Lungs are the site of exchange of gases in the blood. The air we inhaled reaches the lung directly. The inhaled air has a very higher concentration of oxygen than carbon dioxide. Therefore, the partial pressure of carbon dioxide will be lower in the lungs (in normal conditions).

Note: The exchange of gases (oxygen and carbon dioxide) in the respiratory system is based on the partial pressure of gases. Gas diffuse from higher partial region pressure to a region of lower partial pressure.

gladiator answered 2 years ago

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